Phoenix Star 10 Inches Freezable Coil Bong with Glycerin PHX536, stands 10 inches tall as well as a wide and 5mm thick base, a compact glycerin bong to take with you easily when you travel. Constructed of boros glass, glass bong is filled with medical grade glycerin, won't swell when frozen. This freezable bong features a glycerin coil for better chilled flavor. First, you put this glycerin coil bong in the fridge for 1 to 2 hours or more. Second, you take it out of the refrigerator and use it. As you inhale, the smoke goes through the downstem and from the bottom of the straight tube to the mouthpiece. You can enjoy smoother and cooler hits.